<root>
  <tal:block tal:define="global foo string:foo value; global content1">my content 1</tal:block>
  <tal:block tal:define="global content2; bar string:bar value">my content 2</tal:block>
  <tal:block  tal:define="global content3; global content4;">my content 3</tal:block>
  <span tal:content="content1"/>
  <span tal:content="content2"/>
  <span tal:content="content3"/>
  <span tal:content="content4"/>
</root>
